<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>Mollusc Shell - ECHARTS-GL</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes"> <!-- Fullscreen Landscape on iOS -->
    <link rel="stylesheet" href="./common.css">
</head>
<body>
<div id="main"></div>
<script src="../node_modules/echarts/dist/echarts.js"></script>
<script src="../dist/echarts-gl.js"></script>
<script src="lib/jquery.min.js"></script>
<script src="lib/dat.gui.js"></script>
<script src="js/commonUI.js"></script>
<script>
    var chart = echarts.init(document.getElementById('main'));

    var sin = Math.sin;
    var cos = Math.cos;
    var pow = Math.pow;
    var sqrt = Math.sqrt;
    var cosh = Math.cosh;
    var sinh = Math.sinh;
    var PI = Math.PI;

    var aa = 0.4;
    var r = 1 - aa * aa;
    var w = sqrt(r);

    var config = {
        aa: aa
    };

    function getParametricEquation() {
        return {
            u: {
                min: -13.2,
                max: 13.2,
                step: 0.4
            },
            v: {
                min: -37.4,
                max: 37.4,
                step: 0.4
            },
            x: function (u, v) {
                var denom = aa * (pow(w * cosh(aa * u), 2) + aa * pow(sin(w * v), 2))
                return -u + (2 * r * cosh(aa * u) * sinh(aa * u) / denom);
            },
            y: function (u, v) {
                var denom = aa * (pow(w * cosh(aa * u), 2) + aa * pow(sin(w * v), 2))
                return 2 * w * cosh(aa * u) * (-(w * cos(v) * cos(w * v)) - (sin(v) * sin(w * v))) / denom;
            },
            z: function (u, v) {
                var denom = aa * (pow(w * cosh(aa * u), 2) + aa * pow(sin(w * v), 2))
                return 2 * w * cosh(aa * u) * (-(w * sin(v) * cos(w * v)) + (cos(v) * sin(w * v))) / denom
            }
        };
    }

    chart.setOption({
        toolbox: {
            feature: {
                saveAsImage: {
                    backgroundColor: '#111'
                }
            },
            iconStyle: {
                normal: {
                    borderColor: '#fff'
                }
            },
            left: 0
        },
        xAxis3D: {
            type: 'value'
        },
        yAxis3D: {
            type: 'value'
        },
        zAxis3D: {
            type: 'value'
        },
        grid3D: {

            environment: 'none',

            axisPointer: {
                show: false
            },
            axisLine: {
                lineStyle: {
                    color: '#fff'
                }
            },
            postEffect: {
                enable: true,
                screenSpaceAmbientOcclusion: {
                    enable: true,
                    radius: 4,
                    intensity: 2
                }
            },
            temporalSuperSampling: {
                enable: true
            },
            light: {
                main: {
                    intensity: 0
                },
                ambient: {
                    intensity: 0
                },
                ambientCubemap: {
                    texture: 'asset/pisa.hdr',
                    exposure: 1,
                    diffuseIntensity: 1,
                    specularIntensity: 2
                }
            },
            viewControl: {
                // projection: 'orthographic'
            }
        },
        series: [{
            type: 'surface',
            parametric: true,
            shading: 'realistic',
            silent: true,
            wireframe: {
                show: false
            },
            realisticMaterial: {
                roughness: 0.3,
                metalness: 1
            },
            itemStyle: {
                color: '#aaa'
            },
            parametricEquation: getParametricEquation()
        }]
    });

    var gui = new dat.GUI();
    gui.add(config, 'aa', 0.1, 0.9).onFinishChange(function () {
        aa = config.aa;
        chart.setOption({
            series: [{
                parametricEquation: getParametricEquation()
            }]
        });
    })

    window.addEventListener('resize', function () {
        chart.resize();
    });

</script>
</body>
</html>
